Simplex 2120 Multiplex Troubleshooting Guide

4 SSimplex G 987ShPbX m twckeCo Mass 01441.0001 OF CONTENTS Troubleshooting or Intermittent Troubles Code Outline Outline Outline Outline of the 2120 Diagnostic Program Definitions Flowchart Flowchart Flowchart 1 of 2 2 of 2 1 of 2 2 of 2 Flowchart HAZARD seniclng Simplex Ropmssntatlves mpaln pwfannod qusli sfgnlflcsnt system controllsd Outlines Flowcharts publication designed as a troubleshooting in locating 2120 Multiplex System malfunctions the information to isolate most faults to a board level this publication a troubleshooter with a good background 2120 Multiplex Systems will be publication divided two major sections outlines provide details on tests and checks Multiplex System read through these outlines to gain a better understanding of troubleshooting procedures the flowcharts may ask you to perform Before you service a are four separate as shown below basic flowchart to the end of the basic flowchart without being directed is a trouble in the system a test chart Your troubleshooting chart will direct you to the flowchart necessary locate the trouble should always begin there If you can follow the your system working properly another you use the flowcharts one most necessary performing an action the flow exactly as directed without skipping steps The step you skip could be in the reference blocks trouble Be sure to read all information locating you fail to read the referenced material you may not locate the trouble The flowcharts use universal symbols However you are unfamiliar with their meaning to the page of definitions preceding flowcharts Troubleshooting Aids BMUX Operating Placement and Switch Settings Control By Event Operating Time Control Feature Operating SCC Operating SCC Programming BMUX Printer Paper Replacement and Adjustment Procedure 2120 Wiring Diagrams All system order and specification sheets originally shipped with the system Troubleshooting Aids System Crash Code Diagnostics Program or Intermittent Troubles 2120 Multiplex Systems with software Rev 3.17 or later feature a Diagnostic Program which may be used as an program may be the only method the use of the Diagnostic Program precede In the case of obscure or intermittent successfully Suggestions malfunctioning flowcharts Code OutlIne for 2120 Systems using 32K PRAM Boards 562 305 The 2120 BMUX provides a System Crash Code when it fails in such a way that it no longer functions You can the information provided by the code to analyze and determine cause of the failure System Crash Code looks like this YS ERR CC BBISSSS look at each part of the code and see what each means The ERR CC portion of the code indicates of CC You can us8 the value of ts determine specific crash code CC See Table for the possible possible cause s of the system failure The next portion of the code is BB SSSS The only part of this message you should be concerned with is failed PRAM If the value of equals A2 or A3 then you can use the value of to isolate The values of are interpreted as follows OF I for LIKELY CAUSES OF FAILURE An RS232C board locked up The front panel display board is locked up The ribbon cable between motherboard loose or broken front panel display board and the The keyboard option on the 562 513 RS232C board selected the associated OFF The switch settings on a PRAM board are wrong A RAM chip has a bent pin A RAM chip is installed upside down or in the wrong socket A RAM chip is bad A PRAM board is bad The CPU board has failed The switch settings on a PRAM board are wrong A PROM chip has a bent pin A PROM chip is installed upside down or in the wrong socket A PROM chip is bad A PRAM board is bad The CPU board has failed A PRAM board is missing The switch settings on a PRAM board are wrong A PRAM board is bad The CPU board has failed A PROM chip is bad BO CO Cl El through 87,89 I For CPU board has failed There The CPU board has failed